MTN - no response even on Hello peter

Good day I have upgraded my contract and in September and MTN told me I will only pay for one device it’s heading into month 3 and they charging me for 2 devices, this is the second time I’m complaining on hello Peter.I requested the recording as they say it’s available upon request, I’m waiting for it for 2 months and no one has got back to me. I called customer services mailed the complaints department, mailed the head of complaints, mailed the mtn customer care, I placed it on facebook messenger I even went to put the complaint on hello Peter. Mailed the sales agent who sold me the contract.. no one is getting back to me. I have no idea what to do next